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Path: utzoo!watmath!watdaisy!ndiamond
From: ndiamond@watdaisy.UUCP (Norman Diamond)
Newsgroups: net.math
Subject: Re: permuting 0123456789
Message-ID: <7004@watdaisy.UUCP>
Date: Sat, 23-Feb-85 17:38:08 EST
Article-I.D.: watdaisy.7004
Posted: Sat Feb 23 17:38:08 1985
Date-Received: Tue, 26-Feb-85 08:27:07 EST
References: <201@ihnet.UUCP> <8414@brl-tgr.ARPA>
Distribution: net
Organization: U of Waterloo, Ontario
Lines: 17

> > 	How many permutations of the digits 0-9 have no digits in common
> 
> This should be easy:  How many unrestricted permutations are there?
> How many permutations 0xxxxxxxxx are there?  x1xxxxxxxx?  etc.
> Subtract the latter 10 quantities from the first.  Voila!

Sure; we subtract the permutation 0123456789 ten times; we subtract 0123456798
only eight times; etc.  Voila, an incorrect answer!
-- 

   Norman Diamond

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